Re: [OpenBMC] [Linux-5.10] useradd: cannot open /etc/passwd

[Lei Yu <yulei.sh@bytedance.com>]

As discussed in [discord][1], a similar issue could be simply reproduced by:
`touch /etc/passwd`, that gives `Invalid argument`.

With strace, the error is from `utimensat_time64()`

    # ./strace touch /etc/passwd
    execve("/bin/touch", ["touch", "/etc/passwd"], 0x7eef7dd4 /* 16 vars */) = 0
    ......
    getuid32()                              = 0
    utimensat_time64(AT_FDCWD, "/etc/passwd", NULL, 0) = -1 EINVAL
(Invalid argument)
    write(2, "touch: /etc/passwd: Invalid argu"..., 37touch:
/etc/passwd: Invalid argument
    ) = 37
    exit_group(1)

[1]: https://discord.com/channels/775381525260664832/775694683589574659/826065967582281768

On Mon, Mar 29, 2021 at 2:18 PM CS20 CHLi30 <CHLI30@nuvoton.com> wrote:
>
> Hi All,
>
>
>
> We met this issue symptom after upgrading Linux kernel to 5.10.xx.
>
> However, we didn't meet this issue at kernel 5.4 and 5.8.
>
>
>
> And, we had run QEMU with latest palmetto 5.10.23 image, issue symptom also can be repo it.
>
> Is there anyone meet this issue at Linux kernel 5.10.xx? From journal log, we didn’t find any obvious log about this symptom.
>
> This issue is easy to repo and 100%, you can follow below repo step on your OpenBMC project to repo it. Thanks.
>
>
>
> Symptom:
>
> ==============================================================================
>
> Ipmi.Test Ipmi User :: Test suite for OpenBMC IPMI user management.
>
> ==============================================================================
>
> Verify IPMI User Summary :: Verify IPMI maximum supported IPMI use...
>
> | FAIL |
>
> Set User Name command failed (user 9, name HgekZnCI): Unspecified error: 1 != 0
>
>
>
> Journal Log:
>
> olympus-nuvoton kernel: Linux version 5.10.14-711b69d-dirty-08f25ae (oe-user@oe-host)
>
> Mar 18 14:42:26 olympus-nuvoton phosphor-user-manager[1409]: useradd: cannot open /etc/passwd
>
> Mar 18 14:42:26 olympus-nuvoton useradd[1409]: failed adding user 'HgekZnCI', data deleted
>
> Mar 18 14:42:26 olympus-nuvoton phosphor-user-manager[288]: The operation failed internally.
>
> Mar 18 14:42:26 olympus-nuvoton phosphor-user-manager[288]: Unable to create new user
>
> Mar 18 14:42:26 olympus-nuvoton phosphor-user-manager[288]: The operation failed internally.
>
>
>
> How to repo:
>
> 1. Run robot -t Verify_IPMI_User_Summary ipmi/test_ipmi_user.robot or
>
> 2. Execute useradd command to add user in our Olympus-nuvoton runbmc device.
>
>   root@olympus-nuvoton:/# useradd timlee
>
>   useradd: cannot open /etc/passwd
>
>
>
> QEMU for plametto test result:
>
> root@palmetto:~# cat /proc/version
>
> Linux version 5.10.23-6687842 (oe-user@oe-host) (arm-openbmc-linux-gnueabi-gcc (GCC) 10.2.0, GNU ld (GNU Binutils) 2.36.1.20210209) #1 Sun Mar 28 20:54:20 UTC 2021
>
> root@palmetto:~# useradd timlee
>
> useradd: cannot open /etc/passwd
>
>
>
> Debug:
>
> We had added more debug log in overlayfs driver, but seems all overlayfs function call normally without error code return.
>
> Here is the part of log after executing useradd command.
>
>
>
> root@olympus-nuvoton:/# useradd timlee66
>
> Mar 24 05:21:41 olympus-nuvoton kernel: overlayfs: open(a6b0076c[sbin/useradd/l], 0400040) -> (581ac127, 0401400040)
>
> Mar 24 05:21:46 olympus-nuvoton kernel: overlayfs: open(c2f826cb[etc/nsswitch.conf/l], 00) -> (f971c00e, 0401000000)
>
> Mar 24 05:21:46 olympus-nuvoton kernel: overlayfs: open(6fc219b2[etc/ld.so.cache/l], 0400000) -> (0d21569c, 0401400000)
>
> Mar 24 05:21:46 olympus-nuvoton kernel: overlayfs: open(48a47202[lib/libnss_files-2.32.so/l], 0400000) -> (ee6b0bfe, 0401400000)
>
> Mar 24 05:21:46 olympus-nuvoton kernel: overlayfs: open(3c1f263f[etc/passwd/l], 00) -> (b7939c0b, 0401000000)
>
> Mar 24 05:21:46 olympus-nuvoton kernel: overlayfs: open(176fd21b[etc/ld.so.cache/l], 0400000) -> (d2e6be78, 0401400000)
>
> Mar 24 05:21:46 olympus-nuvoton kernel: overlayfs: open(607e8d70[lib/libnss_ldap.so.2/l], 0400000) -> (57f4f2f1, 0401400000)
>
> Mar 24 05:21:52 olympus-nuvoton kernel: overlayfs: create(etc/passwd.985, 0100600) = 0
>
> Mar 24 05:21:52 olympus-nuvoton kernel: overlayfs: open(c46e5b8b[etc/passwd.985/u], 0400001) -> (ef6449e9, 0401400001)
>
> Mar 24 05:21:52 olympus-nuvoton kernel: overlayfs: link(etc/passwd.985, etc/passwd.lock) = 0
>
> Mar 24 05:21:52 olympus-nuvoton kernel: overlayfs: create(work/#1b, 0100000) = 0
>
> Mar 24 05:21:52 olympus-nuvoton kernel: overlayfs: unlink(work/#1b) = 0
>
> Mar 24 05:21:52 olympus-nuvoton useradd[985]: failed adding user 'timlee', data deleted
>
> useradd: cannot open /etc/passwd
>
>
>
> Best regards,
>
> Tim
>
> ________________________________
> The privileged confidential information contained in this email is intended for use only by the addressees as indicated by the original sender of this email. If you are not the addressee indicated in this email or are not responsible for delivery of the email to such a person, please kindly reply to the sender indicating this fact and delete all copies of it from your computer and network server immediately. Your cooperation is highly appreciated. It is advised that any unauthorized use of confidential information of Nuvoton is strictly prohibited; and any information in this email irrelevant to the official business of Nuvoton shall be deemed as neither given nor endorsed by Nuvoton.



-- 
BRs,
Lei YU